Chem 115 Midterm Reveiw

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1

If you have a toothache and the dentist taps your tooth to check for sensitivity, what part of the scientific method is being used?

a. experiment

b. hypothesis

c. theory

d. law

2

1 mg is larger than 1 dg.

True

False

3

At 20C, the density of ethyl alcohol is 0.789 g/mL, and that of water is 1.00 g/mL. Calculate the specific gravity of ethyl alcohol at 20 C.

a. 0.651

b. 0.789

c. 1.45

d. 6.51

4

Each of the numbers below is measured. Solve the calculation and give the correct number of significant figures.
3.52 x 10-16 – 8.16 x 10-17

a. 2.704 x 10-15

b. 4.64 x 1016

c. 2.7 x 10-16

d. 27.04 x 1014

5

Which of the following numbers contains the designated CORRECT number of significant figures?

a. 30.1 C 2 significant figures

b. 3.6 x 102m 3 significant figures

c. 0.00450 m 3 significant figures

d. 27.051 mL 4 significant figures

6

Liquids have ___ shape and ___ volume.

a. fixed/variable

b. fixed/fixed

c. variable/fixed

d. variable/variable

7

Zenapax® is used as part of immunosuppressive therapy for transplant patients. The dosage is calculated on the basis of 1.0 mg/kg. What is the proper dose for a 175 lb patient? (Given: 1kg = 2.205 lbs.)

a. 79 mg

b. 175 mg

c. 385 mg

d. 875 mg

8

A hypothesis is a statement that proposes an explanation of a set of observations.

True

False

9

Which of the following is an example of a physical change?

a. a piece of paper cut into small pieces

b. burning of paper

c. butter becoming rancid

d. baking a cookie

10

Scientific laws differ from scientific theories in that

a. laws explain observations and theories describe observations.

b. laws describe observations and theories explain observations.

c. theories eventually become laws.

d. No difference exists. Laws and theories have the same meaning.

11

A mercury thermometer is used to take four temperatures of a solution. The temperatures are 44.8 ºC, 44.9 ºC, 45.0 ºC, and 45.1 ºC. An alcohol thermometer was also used and measured 44.9 ºC, 45.3 ºC, 45.4 ºC, and 45.9 ºC. The solution is correctly determined to be 45.0 ºC by other means. Which conclusion is correct?

a. The mercury thermometer is the more precise.

b. The alcohol thermometer is the more precise.

c. There is no difference between the thermometers.

d. There is no way to determine precision with these temperatures.

12

The correct conversion of 1 L is ___.

a. 1 m3

b. 1000 m3

. 0.001 m3

d. 100 m3

13

The temperature of a patient is found to be 38.5 C. What is this temperature in F?

a. 96F

b. 101F

c. 69F

d. 107F

14

Water flowing over a dam is an example of

a. potential energy.

b. chemical energy.

c. electrical energy.

d. kinetic energy.

15

Rusting of iron is a physical change

True

False

16

A patient’s temperature is taken three times by two nurses. The results of three successive temperatures by each nurse are

Nurse A Nurse B
98 F 90 F
99 F 100 F
97 F 96 F

The patient’s actual temperature is 101 F. Which of the following statements is true?

a. Nurse A’s results are more precise than those of nurse B.

b. Nurse B’s results are more accurate than those of Nurse A

.c. Both nurses have precise results.

d. Nurse B’s results are both accurate and precise.

17

The normal dosage for azinthromycin, an antibiotic, is 3.3 mg/kg. What is the proper dose for a 150 lb patient? (Given: 1kg = 2.205 lbs.)

a. 100 mg

b. 224 mg

c. 300 mg

d. 495 mg

18

A patient weighs 205.0 pounds, but the weight is to be recorded in kilograms. What is the patient’s weight in kilograms using whole numbers? (Given: 1 kg = 2.205 lbs.)

a. 451.4 kg

b. 205.0 kg

c. 100.4 kg

d. 92.97 kg

19

How much will the temperature change when 3.0 g of tooth enamel (specific heat = 0.18 cal/g C) absorbs 0.80 cal of heat energy?

a. 2.4C

b. 3.7C

c. 1.5C

d. 8.6C

20

The zeros in 0.00958 cm are not significant.

True

False

21

Sulfur has ___ electrons and ___ valence electrons.

a. 16, 6

b. 32, 4

c. 16, 0

d. 32, 6

22

Which statement is correct?

a. Cr is in period 6B.

b. Fe is a transition metal.

c. Mg is an alkali metal.

d. Cl is an inert gas.

23

An atom contains 12 protons and 12 neutrons, and a different atom contains 10 protons and 12 neutrons. These two atoms are not isotopes.

True

False

24

Atoms of elements belonging to the same group have an identical number of

a. total electrons

.b. energy levels.

c. inner electrons.

d. valence electrons.

25

What is the minimum protection against exposure to beta particles?

a. None, beta particles are of low energy and cannot penetrate skin.

b. Gloves, a lab coat, or over a meter’s distance from the source.

c. A thin sheet of plastic or metal.

d. A sheet of lead.

26

The quality factor (QF) for alpha particles is 20. What is the radiation dose in remsfor this patient if he absorbed 13 rads of alpha particles?

a) 20 rems
b) 13 rems
c) 23 rems
*d) 260 rems

27

Which form of ionizing radiation is most penetrating?

a. alpha

b. beta

c. gamma

d. positron

28

Glucose molecules produced during photosynthesis contain higher levels of carbon-12 than carbon -13 because

a. carbon -12 reacts slightly slower than carbon-13.

b. carbon-12 has more electrons than carbon -13.

c. carbon-12 reacts slightly faster than carbon-13.

d. carbon-13 has more number of protons than carbon -12.

29

A Nutrition Facts label on a food package indicates that one serving contains 2% of the recommended daily allowance (RDA) of iodine. If the serving size is one cup and the RDA for iodine is 0.15 mg per day, calculate the amount (in milligrams) supplied by one serving.

a. 0.0030 mg

b. 15 mg

c. 20 mg

d. 0.15 mg

30

The number of moles of calcium (Ca) represented by 7.39 g of calcium is

a. 40.0 moles of Ca.

b. 18.6 moles of Ca.

c. 0.184 mole of Ca.

d. 296 moles of Ca.

31

An atom of cobalt with a mass number of 60 has how many neutrons?

a. 27

b. 33

c. 59

d. 60

32

How many atoms of sodium are there in 0.200 moles sodium atoms?

a. 6.02 x 1024 atoms

b. 6.02 x 1023 atoms

c. 1.20 x 1023 atoms

d. 1.20 x 1024 atoms

33

Radioisotopes with short half-lives are used in diagnostic tests because

a. they have high energy.

b. they are inexpensive.

c. they do not pose health risks by being present long after use.

d. they have less penetration ability.

34

A patient who has undergone a PET scan that used fluorine-18 tagged glucose is likely to emit which of the following a few hours after the procedure?

a. x-rays

b. alpha particles

c. gamma radiation

d. beta particles

35

Mass number refers to

a. total number of protons and electrons.

b. total number of protons.

c. total number of neutrons and protons.

d. total number of neutrons and electrons.

36

The higher up within a group or family on the periodic table,

a. the heavier the nucleus.

b. the more the element is likely to conduct electricity.

c. the more nonmetallic in character.

d. the more the element is likely to be a semimetal.

37

Which statement is incorrect?

a. According to the atomic theory, all matter is composed of atoms.

b. Protons, neutrons, and electrons are subatomic particles.

c. Electrons have greater mass than protons.

d. Neutrons are found in the nucleus of the atom.

38

Calcium is a transition metal as is indicated by its location in the periodic table.

True

False

39

The dosage unit related to the amount of energy absorbed by an object exposed to nuclear radiation is ___.

a. curie

b. rad

c. rem

d. Becquerel

40

Whereas x-ray works well for bones, the value of a CT scan is that

a. it provides a 3 dimensional view of bones.

b. it provides images of the inside of the body

.c. it provides a clear picture of gamma rays produced within the tissue.

d. it provides images used in studies, such as monitoring sugar usage.

41

Which of the following is a physical change?

a. melting of ice

b. burning oxygen in air

c. rusting of iron

d. baking cookies

42

The instructions for a cough syrup are to give 2 teaspoons every 8 hours. The cough syrup is supplied in 150-mL bottles. How many bottles must be purchased to treat 3 children for 5 days? (Given 1 tsp = 5 mL.)

a. 1 bottle

b. 2 bottles

c. 3 bottles

d. 4 bottles

43

When a radioactive isotope emits a(n)___, its atomic number increases.

a. alpha particle

b. beta particle

c. gamma ray

d. positron

44

The dosage unit related to the amount of energy absorbed by an object exposed to nuclear radiation is ___.

a. curie

b. rad

c. rem

d. Becquerel

45

Subatomic particle with a positive charge is a(n) ___.

a. electron

b. neutron

c. proton

d. cation

46

How many atoms of sodium are there in 0.200 moles sodium atoms?

a. 6.02 x 1024
atoms

b. 6.02 x 1023
atoms

c. 1.20 x 1023
atoms

d. 1.20 x 1024atoms

47

What is the weight of Amphotec¨, an antibiotic preparation for aspergillus infection, necessary for a 135 pound patient at the rate of 3.5 mg/kg per dose? (Given: 1kg = 2.205 lbs.)

a. 7.7 mg

b. 61.4 mg

c. 214 mg

d. 2228 mg

48

A scientist, Dr. Sigma, states that a chemical taken internally once a day will prevent the common cold. However, no other scientist is able to duplicate the results. The statement by Dr. Sigma is ___.

a. a law

b. a hypothesis

c. a theory

d. not valid

49

What is the number of 1-1/2 teaspoon doses of a liquid medication in a 250 mL bottle? (Given 1 tsp = 5 mL.)

a. 33 doses

b. 125 doses

c. 167 doses

d. 250 doses

50

Each of the numbers below is measured. Solve the calculation and give the correct number of significant figures._(2.34 x 104 ) x (1.38 x 107)

a. 3.2 x 1011

b. 3.23 x 1011

c. 3.229 x 1011

d. 3.23 x 1012

51

The zeros in 1700.85 cal are not significant.

True

False

52

Choose the incorrect statement about the proton:

a. The proton has the atomic mass of 1 amu.

b. The proton has the same charge as the neutron.

c. The proton has greater mass than an electron.

d. The proton and the neutron have approximately the same atomic mass.

53

An isotope of sodium contains 11 protons and 12 neutrons.

a. The atom also contains 11 electrons.

b. The atom also contains 12 electrons.

c. The atom also contains 23 electrons.

d. There are no other factors related to the 11 protons and 12 neutrons.

54

The higher the quality factor (QF) of a radiation, the less harmful the exposure to the radiation.

True

False

55

The maximum number of electrons that a particular energy level n can hold is ___.

a. n2

b. 2n

c. 2n2

d. n-1

56

If one starts with 10.0 grams of a radioactive substance, how much will remain after 3 half lives?

a. 1.25 g

b. 2.50 g

c. 3.33 g

d. 5.00 g

57

At 20 C, chloroform (CHCl3) has a density of 1.489 g/mL. What is the mass of 7.52 mL of chloroform at 20 C?

a. 0.198 g

b. 13.4 g

c. 5.05 g

d. 11.2 g

58

The density of table salt is 2.16 g/mL. What is the volume in milliliters occupied by 356.0 g of table salt?

a. 165 mL

b. 769 mL

c. 0.00607 mL

d. 358 mL

59

While attempting to start your car, when you turn the key, there is no response. You suspect that the battery is dead. To determine this, you turn on the light switch. Your suspicion about the battery is an example of a ___, and your attempt to turn on the headlight is an example of a ___.

a. theory, law

b. hypothesis, experiment

c. experiment, hypothesis

d. hypothesis, theory

60

All matter is composed of tiny, indivisible particles called atoms. All atoms are composed of protons, neutrons, and electrons. These statements are an example of a scientific ___.

a. 5.8223

b. 5.822

c. 5.82

d. 5.8

61

Where are the metals located on the periodic table of the elements?

a. On the right side of the metalloid line (not including the metalloids).

b. On the last group of the periodic table.

c. On the left side of the metalloid line (not including the methalloids).

d. In the two sections separated from the rest of the table.

62

Which of the substances listed below is not an element?

a. sodium

b. iron

c. air

d. carbon

63

Mg has how many protons, neutrons, and electrons?

a. 12 protons, 23 neutrons, and 23 electrons

b. 12 protons, 11 neutrons, and 11 electrons

c. 23 protons, 11 neutrons, and 23 electrons

. 12 protons, 11 neutrons, and 12 electrons

64

Emission of a beta particle increases the number of protons in an atom's nucleus.

True

False

65

Which of the following is the correct order of elements in increasing atomic radius: K, Mg, B?

a. K<Mg<B

b. B<Mg<K

c. Mg<K<B

d. B<K<Mg

66

During melting of ice

a. the temperature remains constant even as more heat is added until all of the ice has melted

. the temperature increases until all the ice has melted

c. the temperature decreases until the ice has melted

d. the energy that goes into converting ice to liquid water is called heat of vaporization

67

Which of the following is a chemical property?

a. color

b. flammability

c. odo

rd. hardness

68

The density of gasoline is 0.73 g/mL at 20 C. Jenny's car requires 16 gallons of gasoline to fill her car's gas tank. How much mass (in pounds) of gasoline does she need to fill her tank? (Given: 1 qt= 0.946 L, 1 gallon = 4 qt, 1 Ib = 454 g, 1 mL= 1 x 10-3 L.)

a. 190 Ib

b. 340 Ib

c. 140 Ib

d. 210 Ib

69

A kitten's normal body temperature is 102¼F. Express this temperature in ¼C.

a. 5.7 ¼C

b. 38.9 ¼C

c. 56.7 ¼C

d. 184 ¼C

70

886.0 has four significant figures.

True

False

71

A 35 mg dose of iodine-131 with a half-life of 8 days is administered to a patient. How long will it take for the iodine to decay so that there are only about 2 mg remaining?

a. 8 days

b. 16 days

c. 32 days

d. 64 days

72

Two atoms that are isotopes of an element contain

a. the same number of electrons and neutrons.

b. the same number of protons and neutrons.

c. the same number of protons and a different number of neutrons.

d. different numbers of protons.

73

The unit commonly used to measure the amount of tissue damage that is produced by an exposure to ionizing radiation is ___.

a. rem

b. rad

c. curie

d. Becquerel

74

Boron, which occurs in nature as 10 5B (amu = 10.013) and 11 5B (amu = 11.009), has an atomic weight of 10.81. Which of the following statements is true?

a. isotope11 5B predominates

b. isotope10 5B predominates

c. both isotopes have equal percentages in nature

d. the atomic weight of 10.013 amu is nearest the correct value for boron

75

Which of the following is not a type of subatomic particle?

a. alpha particle

b. electron

c. neutron

d. proton

76

When 15.5 + 0.125 + 2.55 are added, assuming each of the numbers below is measured, the answer with the correct number of significant figures is ___.

a. 18.175

b. 18.2

c. 18.17

d. 18

77

Which is a unit of measure of mass?

a. liter

b. ¼C

c. kilogram

d. Joule

78

Iron has the atomic weight of 55.9. What is the number of atoms in one mole of iron?

a. 55.9 atoms

b. 1 x 1024 atoms

c. 6.02 x 1023 atoms

d. 12 dozen atoms

79

What is the number of atoms present in a 20.gram sample of lithium?

a. 1.38 x 102

b. 1.20 x 1025

c. 1.70 x 1024

d. 4.00x 1024

80

What is the relationship of a metal atom to the right of another metal atom in the same period?

a. The atom to the right is usually the smaller in diameter.

b. The atom to the right is usually the smaller in atomic weight.

c. The atom to the right is usually the smaller in atomic number.

d. The atom to the right is more likely to have fewer isotopes.

81

Whereas x-ray works well for bones, the value of MRI imaging is that

a. it provides a 3 dimensional view of bones.

b. it provides images of the inside of the body.

c. it provides a clear picture of gamma rays produced within the tissue.

d. it provides images used in studies, such as monitoring sugar usage.

82

At 20 C, chloroform (CHCl3) has a density of 1.489 g/mL. What is the mass of 7.52 mL of chloroform at 20 C?

a. 0.198 g

b. 13.4 g

c. 5.05 g

d. 11.2 g

83

An isotope of sodium contains 11 protons and 12 neutrons.

a. The atom also contains 11 electrons.

b. The atom also contains 12 electrons

.c. The atom also contains 23 electrons.

d. There are no other factors related to the 11 protons and 12 neutrons.